package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.Follow;
import com.hmdp.mapper.FollowMapper;
import com.hmdp.service.IFollowService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.service.IUserService;
import com.hmdp.utils.UserHolder;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class FollowServiceImpl extends ServiceImpl<FollowMapper, Follow> implements IFollowService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;
  @Resource
  private IUserService userService;
    public Result follow(Long followUserId, Boolean isFollow) {
       Long userId=UserHolder.getUser().getId();
       String key="follows:"+userId;
       if(isFollow){
           Follow follow=new Follow();
           follow.setUserId(userId);
           follow.setFollowUserId(followUserId);
           boolean isSuccess=save(follow);
           if(isSuccess){
               stringRedisTemplate.opsForSet().add(key,followUserId.toString());

           }
       }else {
         boolean isSuccess=  remove(new QueryWrapper<Follow>().eq("user_id",userId).eq("follow_user_id",followUserId));
         if(isSuccess){
             stringRedisTemplate.opsForSet().remove(key,followUserId.toString());

         }

       }
        return Result.ok();
    }

    public Result isFollow(Long followUserId) {
        Long userId= UserHolder.getUser().getId();
        Integer count=query().eq("user_id",userId).eq("follow_user_id",followUserId).count();

        return Result.ok(count>0);
    }
    public  Result commonfollow(Long followUserId){
        Long userId=UserHolder.getUser().getId();
        String key="follows:"+userId;
        String key2="follows:"+followUserId;
        Set<String> intersect=stringRedisTemplate.opsForSet().intersect(key,key2);
        if(intersect == null || intersect.isEmpty()){
            return Result.ok(Collections.emptyList());
        }
        List<Long> ids=intersect.stream().map(Long::valueOf).collect(Collectors.toList());
        List<UserDTO> users=userService.listByIds(ids)
                .stream().map(user -> BeanUtil.copyProperties(user,UserDTO.class))
                .collect(Collectors.toList());
        return Result.ok(users);
    }
}
